Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/delegation.c | |
3 | * | |
4 | * Copyright (C) 2004 Trond Myklebust | |
5 | * | |
6 | * NFS file delegation management | |
7 | * | |
8 | */ | |
1da177e4 | 9 | #include <linux/completion.h> |
58d9714a | 10 | #include <linux/kthread.h> |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/sched.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
1da177e4 LT |
14 | #include <linux/spinlock.h> |
15 | ||
16 | #include <linux/nfs4.h> | |
17 | #include <linux/nfs_fs.h> | |
18 | #include <linux/nfs_xdr.h> | |
19 | ||
4ce79717 | 20 | #include "nfs4_fs.h" |
1da177e4 | 21 | #include "delegation.h" |
24c8dbbb | 22 | #include "internal.h" |
1da177e4 | 23 | |
905f8d16 | 24 | static void nfs_do_free_delegation(struct nfs_delegation *delegation) |
1da177e4 | 25 | { |
17d2c0a0 DH |
26 | if (delegation->cred) |
27 | put_rpccred(delegation->cred); | |
1da177e4 LT |
28 | kfree(delegation); |
29 | } | |
30 | ||
8383e460 TM |
31 | static void nfs_free_delegation_callback(struct rcu_head *head) |
32 | { | |
33 | struct nfs_delegation *delegation = container_of(head, struct nfs_delegation, rcu); | |
34 | ||
905f8d16 TM |
35 | nfs_do_free_delegation(delegation); |
36 | } | |
37 | ||
38 | static void nfs_free_delegation(struct nfs_delegation *delegation) | |
39 | { | |
905f8d16 | 40 | call_rcu(&delegation->rcu, nfs_free_delegation_callback); |
8383e460 TM |
41 | } |
42 | ||
d3978bb3 CL |
43 | /** |
44 | * nfs_mark_delegation_referenced - set delegation's REFERENCED flag | |
45 | * @delegation: delegation to process | |
46 | * | |
47 | */ | |
b7391f44 TM |
48 | void nfs_mark_delegation_referenced(struct nfs_delegation *delegation) |
49 | { | |
50 | set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags); | |
51 | } | |
52 | ||
d3978bb3 CL |
53 | /** |
54 | * nfs_have_delegation - check if inode has a delegation | |
55 | * @inode: inode to check | |
56 | * @flags: delegation types to check for | |
57 | * | |
58 | * Returns one if inode has the indicated delegation, otherwise zero. | |
59 | */ | |
bd7bf9d5 | 60 | int nfs_have_delegation(struct inode *inode, fmode_t flags) |
b7391f44 TM |
61 | { |
62 | struct nfs_delegation *delegation; | |
63 | int ret = 0; | |
64 | ||
65 | flags &= FMODE_READ|FMODE_WRITE; | |
66 | rcu_read_lock(); | |
67 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
68 | if (delegation != NULL && (delegation->type & flags) == flags) { | |
69 | nfs_mark_delegation_referenced(delegation); | |
70 | ret = 1; | |
71 | } | |
72 | rcu_read_unlock(); | |
73 | return ret; | |
74 | } | |
75 | ||
888e694c TM |
76 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state) |
77 | { | |
78 | struct inode *inode = state->inode; | |
79 | struct file_lock *fl; | |
d5122201 | 80 | int status = 0; |
888e694c | 81 | |
3f09df70 TM |
82 | if (inode->i_flock == NULL) |
83 | goto out; | |
84 | ||
b89f4321 AB |
85 | /* Protect inode->i_flock using the file locks lock */ |
86 | lock_flocks(); | |
90dc7d27 | 87 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
888e694c TM |
88 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
89 | continue; | |
cd3758e3 | 90 | if (nfs_file_open_context(fl->fl_file) != ctx) |
888e694c | 91 | continue; |
b89f4321 | 92 | unlock_flocks(); |
888e694c | 93 | status = nfs4_lock_delegation_recall(state, fl); |
d5122201 | 94 | if (status < 0) |
3f09df70 | 95 | goto out; |
b89f4321 | 96 | lock_flocks(); |
888e694c | 97 | } |
b89f4321 | 98 | unlock_flocks(); |
3f09df70 | 99 | out: |
888e694c TM |
100 | return status; |
101 | } | |
102 | ||
d18cc1fd | 103 | static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid) |
1da177e4 LT |
104 | { |
105 | struct nfs_inode *nfsi = NFS_I(inode); | |
106 | struct nfs_open_context *ctx; | |
107 | struct nfs4_state *state; | |
888e694c | 108 | int err; |
1da177e4 LT |
109 | |
110 | again: | |
111 | spin_lock(&inode->i_lock); | |
112 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
113 | state = ctx->state; | |
114 | if (state == NULL) | |
115 | continue; | |
116 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
117 | continue; | |
90163027 TM |
118 | if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0) |
119 | continue; | |
1da177e4 LT |
120 | get_nfs_open_context(ctx); |
121 | spin_unlock(&inode->i_lock); | |
13437e12 | 122 | err = nfs4_open_delegation_recall(ctx, state, stateid); |
888e694c TM |
123 | if (err >= 0) |
124 | err = nfs_delegation_claim_locks(ctx, state); | |
1da177e4 | 125 | put_nfs_open_context(ctx); |
888e694c | 126 | if (err != 0) |
d18cc1fd | 127 | return err; |
1da177e4 LT |
128 | goto again; |
129 | } | |
130 | spin_unlock(&inode->i_lock); | |
d18cc1fd | 131 | return 0; |
1da177e4 LT |
132 | } |
133 | ||
d3978bb3 CL |
134 | /** |
135 | * nfs_inode_reclaim_delegation - process a delegation reclaim request | |
136 | * @inode: inode to process | |
137 | * @cred: credential to use for request | |
138 | * @res: new delegation state from server | |
139 | * | |
1da177e4 | 140 | */ |
d3978bb3 CL |
141 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, |
142 | struct nfs_openres *res) | |
1da177e4 | 143 | { |
8f649c37 TM |
144 | struct nfs_delegation *delegation; |
145 | struct rpc_cred *oldcred = NULL; | |
1da177e4 | 146 | |
8f649c37 TM |
147 | rcu_read_lock(); |
148 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
149 | if (delegation != NULL) { | |
150 | spin_lock(&delegation->lock); | |
151 | if (delegation->inode != NULL) { | |
152 | memcpy(delegation->stateid.data, res->delegation.data, | |
153 | sizeof(delegation->stateid.data)); | |
154 | delegation->type = res->delegation_type; | |
155 | delegation->maxsize = res->maxsize; | |
156 | oldcred = delegation->cred; | |
157 | delegation->cred = get_rpccred(cred); | |
158 | clear_bit(NFS_DELEGATION_NEED_RECLAIM, | |
159 | &delegation->flags); | |
160 | NFS_I(inode)->delegation_state = delegation->type; | |
161 | spin_unlock(&delegation->lock); | |
162 | put_rpccred(oldcred); | |
163 | rcu_read_unlock(); | |
164 | } else { | |
165 | /* We appear to have raced with a delegation return. */ | |
166 | spin_unlock(&delegation->lock); | |
167 | rcu_read_unlock(); | |
168 | nfs_inode_set_delegation(inode, cred, res); | |
169 | } | |
170 | } else { | |
171 | rcu_read_unlock(); | |
172 | } | |
1da177e4 LT |
173 | } |
174 | ||
57bfa891 TM |
175 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
176 | { | |
177 | int res = 0; | |
178 | ||
179 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync); | |
180 | nfs_free_delegation(delegation); | |
181 | return res; | |
182 | } | |
183 | ||
86e89489 TM |
184 | static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation) |
185 | { | |
186 | struct inode *inode = NULL; | |
187 | ||
188 | spin_lock(&delegation->lock); | |
189 | if (delegation->inode != NULL) | |
190 | inode = igrab(delegation->inode); | |
191 | spin_unlock(&delegation->lock); | |
192 | return inode; | |
193 | } | |
194 | ||
dda4b225 CL |
195 | static struct nfs_delegation * |
196 | nfs_detach_delegation_locked(struct nfs_inode *nfsi, | |
d3978bb3 | 197 | struct nfs_server *server) |
57bfa891 | 198 | { |
17d2c0a0 DH |
199 | struct nfs_delegation *delegation = |
200 | rcu_dereference_protected(nfsi->delegation, | |
d3978bb3 | 201 | lockdep_is_held(&server->nfs_client->cl_lock)); |
57bfa891 TM |
202 | |
203 | if (delegation == NULL) | |
204 | goto nomatch; | |
dda4b225 | 205 | |
34310430 | 206 | spin_lock(&delegation->lock); |
57bfa891 | 207 | list_del_rcu(&delegation->super_list); |
86e89489 | 208 | delegation->inode = NULL; |
57bfa891 TM |
209 | nfsi->delegation_state = 0; |
210 | rcu_assign_pointer(nfsi->delegation, NULL); | |
34310430 | 211 | spin_unlock(&delegation->lock); |
57bfa891 TM |
212 | return delegation; |
213 | nomatch: | |
214 | return NULL; | |
215 | } | |
216 | ||
dda4b225 | 217 | static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi, |
d3978bb3 | 218 | struct nfs_server *server) |
dda4b225 | 219 | { |
d3978bb3 | 220 | struct nfs_client *clp = server->nfs_client; |
dda4b225 CL |
221 | struct nfs_delegation *delegation; |
222 | ||
223 | spin_lock(&clp->cl_lock); | |
d3978bb3 | 224 | delegation = nfs_detach_delegation_locked(nfsi, server); |
dda4b225 CL |
225 | spin_unlock(&clp->cl_lock); |
226 | return delegation; | |
227 | } | |
228 | ||
d3978bb3 CL |
229 | /** |
230 | * nfs_inode_set_delegation - set up a delegation on an inode | |
231 | * @inode: inode to which delegation applies | |
232 | * @cred: cred to use for subsequent delegation processing | |
233 | * @res: new delegation state from server | |
234 | * | |
235 | * Returns zero on success, or a negative errno value. | |
1da177e4 LT |
236 | */ |
237 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) | |
238 | { | |
d3978bb3 CL |
239 | struct nfs_server *server = NFS_SERVER(inode); |
240 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 241 | struct nfs_inode *nfsi = NFS_I(inode); |
17d2c0a0 | 242 | struct nfs_delegation *delegation, *old_delegation; |
57bfa891 | 243 | struct nfs_delegation *freeme = NULL; |
1da177e4 LT |
244 | int status = 0; |
245 | ||
8535b2be | 246 | delegation = kmalloc(sizeof(*delegation), GFP_NOFS); |
1da177e4 LT |
247 | if (delegation == NULL) |
248 | return -ENOMEM; | |
249 | memcpy(delegation->stateid.data, res->delegation.data, | |
250 | sizeof(delegation->stateid.data)); | |
251 | delegation->type = res->delegation_type; | |
252 | delegation->maxsize = res->maxsize; | |
beb2a5ec | 253 | delegation->change_attr = nfsi->change_attr; |
1da177e4 LT |
254 | delegation->cred = get_rpccred(cred); |
255 | delegation->inode = inode; | |
b7391f44 | 256 | delegation->flags = 1<<NFS_DELEGATION_REFERENCED; |
34310430 | 257 | spin_lock_init(&delegation->lock); |
1da177e4 LT |
258 | |
259 | spin_lock(&clp->cl_lock); | |
17d2c0a0 | 260 | old_delegation = rcu_dereference_protected(nfsi->delegation, |
d3978bb3 | 261 | lockdep_is_held(&clp->cl_lock)); |
17d2c0a0 DH |
262 | if (old_delegation != NULL) { |
263 | if (memcmp(&delegation->stateid, &old_delegation->stateid, | |
264 | sizeof(old_delegation->stateid)) == 0 && | |
265 | delegation->type == old_delegation->type) { | |
57bfa891 | 266 | goto out; |
1da177e4 | 267 | } |
57bfa891 TM |
268 | /* |
269 | * Deal with broken servers that hand out two | |
270 | * delegations for the same file. | |
271 | */ | |
272 | dfprintk(FILE, "%s: server %s handed out " | |
273 | "a duplicate delegation!\n", | |
3110ff80 | 274 | __func__, clp->cl_hostname); |
17d2c0a0 | 275 | if (delegation->type <= old_delegation->type) { |
57bfa891 TM |
276 | freeme = delegation; |
277 | delegation = NULL; | |
278 | goto out; | |
279 | } | |
d3978bb3 | 280 | freeme = nfs_detach_delegation_locked(nfsi, server); |
1da177e4 | 281 | } |
d3978bb3 | 282 | list_add_rcu(&delegation->super_list, &server->delegations); |
57bfa891 TM |
283 | nfsi->delegation_state = delegation->type; |
284 | rcu_assign_pointer(nfsi->delegation, delegation); | |
285 | delegation = NULL; | |
412c77ce TM |
286 | |
287 | /* Ensure we revalidate the attributes and page cache! */ | |
288 | spin_lock(&inode->i_lock); | |
289 | nfsi->cache_validity |= NFS_INO_REVAL_FORCED; | |
290 | spin_unlock(&inode->i_lock); | |
291 | ||
57bfa891 | 292 | out: |
1da177e4 | 293 | spin_unlock(&clp->cl_lock); |
603c83da TM |
294 | if (delegation != NULL) |
295 | nfs_free_delegation(delegation); | |
57bfa891 TM |
296 | if (freeme != NULL) |
297 | nfs_do_return_delegation(inode, freeme, 0); | |
1da177e4 LT |
298 | return status; |
299 | } | |
300 | ||
1da177e4 LT |
301 | /* |
302 | * Basic procedure for returning a delegation to the server | |
303 | */ | |
d18cc1fd | 304 | static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync) |
1da177e4 | 305 | { |
1da177e4 | 306 | struct nfs_inode *nfsi = NFS_I(inode); |
d18cc1fd | 307 | int err; |
1da177e4 | 308 | |
3f09df70 TM |
309 | /* |
310 | * Guard against new delegated open/lock/unlock calls and against | |
311 | * state recovery | |
312 | */ | |
1da177e4 | 313 | down_write(&nfsi->rwsem); |
d18cc1fd | 314 | err = nfs_delegation_claim_opens(inode, &delegation->stateid); |
1da177e4 | 315 | up_write(&nfsi->rwsem); |
d18cc1fd TM |
316 | if (err) |
317 | goto out; | |
1da177e4 | 318 | |
d18cc1fd TM |
319 | err = nfs_do_return_delegation(inode, delegation, issync); |
320 | out: | |
321 | return err; | |
90163027 TM |
322 | } |
323 | ||
d3978bb3 CL |
324 | /** |
325 | * nfs_client_return_marked_delegations - return previously marked delegations | |
326 | * @clp: nfs_client to process | |
327 | * | |
328 | * Returns zero on success, or a negative errno value. | |
515d8611 | 329 | */ |
d18cc1fd | 330 | int nfs_client_return_marked_delegations(struct nfs_client *clp) |
515d8611 TM |
331 | { |
332 | struct nfs_delegation *delegation; | |
d3978bb3 | 333 | struct nfs_server *server; |
515d8611 | 334 | struct inode *inode; |
d18cc1fd | 335 | int err = 0; |
515d8611 TM |
336 | |
337 | restart: | |
338 | rcu_read_lock(); | |
d3978bb3 CL |
339 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
340 | list_for_each_entry_rcu(delegation, &server->delegations, | |
341 | super_list) { | |
342 | if (!test_and_clear_bit(NFS_DELEGATION_RETURN, | |
343 | &delegation->flags)) | |
344 | continue; | |
345 | inode = nfs_delegation_grab_inode(delegation); | |
346 | if (inode == NULL) | |
347 | continue; | |
348 | delegation = nfs_detach_delegation(NFS_I(inode), | |
349 | server); | |
350 | rcu_read_unlock(); | |
351 | ||
352 | if (delegation != NULL) { | |
353 | filemap_flush(inode->i_mapping); | |
354 | err = __nfs_inode_return_delegation(inode, | |
355 | delegation, 0); | |
356 | } | |
357 | iput(inode); | |
358 | if (!err) | |
359 | goto restart; | |
360 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
361 | return err; | |
d18cc1fd | 362 | } |
515d8611 TM |
363 | } |
364 | rcu_read_unlock(); | |
d18cc1fd | 365 | return 0; |
515d8611 TM |
366 | } |
367 | ||
d3978bb3 CL |
368 | /** |
369 | * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens | |
370 | * @inode: inode to process | |
371 | * | |
372 | * Does not protect against delegation reclaims, therefore really only safe | |
373 | * to be called from nfs4_clear_inode(). | |
e6f81075 TM |
374 | */ |
375 | void nfs_inode_return_delegation_noreclaim(struct inode *inode) | |
376 | { | |
d3978bb3 | 377 | struct nfs_server *server = NFS_SERVER(inode); |
e6f81075 TM |
378 | struct nfs_inode *nfsi = NFS_I(inode); |
379 | struct nfs_delegation *delegation; | |
380 | ||
17d2c0a0 | 381 | if (rcu_access_pointer(nfsi->delegation) != NULL) { |
d3978bb3 | 382 | delegation = nfs_detach_delegation(nfsi, server); |
e6f81075 TM |
383 | if (delegation != NULL) |
384 | nfs_do_return_delegation(inode, delegation, 0); | |
385 | } | |
386 | } | |
387 | ||
d3978bb3 CL |
388 | /** |
389 | * nfs_inode_return_delegation - synchronously return a delegation | |
390 | * @inode: inode to process | |
391 | * | |
392 | * Returns zero on success, or a negative errno value. | |
393 | */ | |
90163027 TM |
394 | int nfs_inode_return_delegation(struct inode *inode) |
395 | { | |
d3978bb3 | 396 | struct nfs_server *server = NFS_SERVER(inode); |
90163027 TM |
397 | struct nfs_inode *nfsi = NFS_I(inode); |
398 | struct nfs_delegation *delegation; | |
399 | int err = 0; | |
400 | ||
17d2c0a0 | 401 | if (rcu_access_pointer(nfsi->delegation) != NULL) { |
d3978bb3 | 402 | delegation = nfs_detach_delegation(nfsi, server); |
d18cc1fd | 403 | if (delegation != NULL) { |
1b924e5f | 404 | nfs_wb_all(inode); |
d18cc1fd TM |
405 | err = __nfs_inode_return_delegation(inode, delegation, 1); |
406 | } | |
90163027 TM |
407 | } |
408 | return err; | |
1da177e4 LT |
409 | } |
410 | ||
d3978bb3 | 411 | static void nfs_mark_return_delegation(struct nfs_delegation *delegation) |
6411bd4a | 412 | { |
d3978bb3 CL |
413 | struct nfs_client *clp = NFS_SERVER(delegation->inode)->nfs_client; |
414 | ||
6411bd4a TM |
415 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
416 | set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state); | |
417 | } | |
418 | ||
d3978bb3 CL |
419 | /** |
420 | * nfs_super_return_all_delegations - return delegations for one superblock | |
421 | * @sb: sb to process | |
422 | * | |
1da177e4 | 423 | */ |
515d8611 | 424 | void nfs_super_return_all_delegations(struct super_block *sb) |
1da177e4 | 425 | { |
d3978bb3 CL |
426 | struct nfs_server *server = NFS_SB(sb); |
427 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 428 | struct nfs_delegation *delegation; |
1da177e4 LT |
429 | |
430 | if (clp == NULL) | |
431 | return; | |
d3978bb3 | 432 | |
8383e460 | 433 | rcu_read_lock(); |
d3978bb3 | 434 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
86e89489 | 435 | spin_lock(&delegation->lock); |
d3978bb3 | 436 | set_bit(NFS_DELEGATION_RETURN, &delegation->flags); |
86e89489 | 437 | spin_unlock(&delegation->lock); |
1da177e4 | 438 | } |
8383e460 | 439 | rcu_read_unlock(); |
d3978bb3 | 440 | |
d18cc1fd TM |
441 | if (nfs_client_return_marked_delegations(clp) != 0) |
442 | nfs4_schedule_state_manager(clp); | |
515d8611 TM |
443 | } |
444 | ||
d3978bb3 CL |
445 | static void nfs_mark_return_all_delegation_types(struct nfs_server *server, |
446 | fmode_t flags) | |
515d8611 TM |
447 | { |
448 | struct nfs_delegation *delegation; | |
449 | ||
d3978bb3 | 450 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
c79571a5 AB |
451 | if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE)) |
452 | continue; | |
453 | if (delegation->type & flags) | |
d3978bb3 | 454 | nfs_mark_return_delegation(delegation); |
707fb4b3 | 455 | } |
d3978bb3 CL |
456 | } |
457 | ||
458 | static void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp, | |
459 | fmode_t flags) | |
460 | { | |
461 | struct nfs_server *server; | |
462 | ||
463 | rcu_read_lock(); | |
464 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
465 | nfs_mark_return_all_delegation_types(server, flags); | |
515d8611 | 466 | rcu_read_unlock(); |
1da177e4 LT |
467 | } |
468 | ||
c79571a5 AB |
469 | static void nfs_client_mark_return_all_delegations(struct nfs_client *clp) |
470 | { | |
471 | nfs_client_mark_return_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
472 | } | |
473 | ||
b0d3ded1 | 474 | static void nfs_delegation_run_state_manager(struct nfs_client *clp) |
58d9714a | 475 | { |
b0d3ded1 TM |
476 | if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) |
477 | nfs4_schedule_state_manager(clp); | |
58d9714a TM |
478 | } |
479 | ||
d3978bb3 CL |
480 | /** |
481 | * nfs_expire_all_delegation_types | |
482 | * @clp: client to process | |
483 | * @flags: delegation types to expire | |
484 | * | |
485 | */ | |
31f09607 | 486 | void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags) |
58d9714a | 487 | { |
c79571a5 | 488 | nfs_client_mark_return_all_delegation_types(clp, flags); |
b0d3ded1 | 489 | nfs_delegation_run_state_manager(clp); |
58d9714a TM |
490 | } |
491 | ||
d3978bb3 CL |
492 | /** |
493 | * nfs_expire_all_delegations | |
494 | * @clp: client to process | |
495 | * | |
496 | */ | |
c79571a5 AB |
497 | void nfs_expire_all_delegations(struct nfs_client *clp) |
498 | { | |
499 | nfs_expire_all_delegation_types(clp, FMODE_READ|FMODE_WRITE); | |
500 | } | |
501 | ||
d3978bb3 CL |
502 | /** |
503 | * nfs_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN | |
504 | * @clp: client to process | |
505 | * | |
1da177e4 | 506 | */ |
adfa6f98 | 507 | void nfs_handle_cb_pathdown(struct nfs_client *clp) |
1da177e4 | 508 | { |
1da177e4 LT |
509 | if (clp == NULL) |
510 | return; | |
707fb4b3 | 511 | nfs_client_mark_return_all_delegations(clp); |
1da177e4 LT |
512 | } |
513 | ||
d3978bb3 | 514 | static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server) |
b7391f44 TM |
515 | { |
516 | struct nfs_delegation *delegation; | |
517 | ||
d3978bb3 | 518 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { |
b7391f44 TM |
519 | if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags)) |
520 | continue; | |
d3978bb3 | 521 | nfs_mark_return_delegation(delegation); |
b7391f44 | 522 | } |
b7391f44 TM |
523 | } |
524 | ||
d3978bb3 CL |
525 | /** |
526 | * nfs_expire_unreferenced_delegations - Eliminate unused delegations | |
527 | * @clp: nfs_client to process | |
528 | * | |
529 | */ | |
b7391f44 TM |
530 | void nfs_expire_unreferenced_delegations(struct nfs_client *clp) |
531 | { | |
d3978bb3 CL |
532 | struct nfs_server *server; |
533 | ||
534 | rcu_read_lock(); | |
535 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
536 | nfs_mark_return_unreferenced_delegations(server); | |
537 | rcu_read_unlock(); | |
538 | ||
b7391f44 TM |
539 | nfs_delegation_run_state_manager(clp); |
540 | } | |
541 | ||
d3978bb3 CL |
542 | /** |
543 | * nfs_async_inode_return_delegation - asynchronously return a delegation | |
544 | * @inode: inode to process | |
545 | * @stateid: state ID information from CB_RECALL arguments | |
546 | * | |
547 | * Returns zero on success, or a negative errno value. | |
1da177e4 | 548 | */ |
d3978bb3 CL |
549 | int nfs_async_inode_return_delegation(struct inode *inode, |
550 | const nfs4_stateid *stateid) | |
1da177e4 | 551 | { |
6411bd4a TM |
552 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
553 | struct nfs_delegation *delegation; | |
1da177e4 | 554 | |
6411bd4a TM |
555 | rcu_read_lock(); |
556 | delegation = rcu_dereference(NFS_I(inode)->delegation); | |
2597641d | 557 | |
e047a10c | 558 | if (!clp->cl_mvops->validate_stateid(delegation, stateid)) { |
6411bd4a TM |
559 | rcu_read_unlock(); |
560 | return -ENOENT; | |
561 | } | |
d3978bb3 | 562 | nfs_mark_return_delegation(delegation); |
6411bd4a | 563 | rcu_read_unlock(); |
d3978bb3 | 564 | |
6411bd4a TM |
565 | nfs_delegation_run_state_manager(clp); |
566 | return 0; | |
1da177e4 LT |
567 | } |
568 | ||
d3978bb3 CL |
569 | static struct inode * |
570 | nfs_delegation_find_inode_server(struct nfs_server *server, | |
571 | const struct nfs_fh *fhandle) | |
1da177e4 LT |
572 | { |
573 | struct nfs_delegation *delegation; | |
574 | struct inode *res = NULL; | |
d3978bb3 CL |
575 | |
576 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) { | |
86e89489 TM |
577 | spin_lock(&delegation->lock); |
578 | if (delegation->inode != NULL && | |
579 | nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { | |
1da177e4 | 580 | res = igrab(delegation->inode); |
1da177e4 | 581 | } |
86e89489 TM |
582 | spin_unlock(&delegation->lock); |
583 | if (res != NULL) | |
584 | break; | |
1da177e4 | 585 | } |
d3978bb3 CL |
586 | return res; |
587 | } | |
588 | ||
589 | /** | |
590 | * nfs_delegation_find_inode - retrieve the inode associated with a delegation | |
591 | * @clp: client state handle | |
592 | * @fhandle: filehandle from a delegation recall | |
593 | * | |
594 | * Returns pointer to inode matching "fhandle," or NULL if a matching inode | |
595 | * cannot be found. | |
596 | */ | |
597 | struct inode *nfs_delegation_find_inode(struct nfs_client *clp, | |
598 | const struct nfs_fh *fhandle) | |
599 | { | |
600 | struct nfs_server *server; | |
601 | struct inode *res = NULL; | |
602 | ||
603 | rcu_read_lock(); | |
604 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
605 | res = nfs_delegation_find_inode_server(server, fhandle); | |
606 | if (res != NULL) | |
607 | break; | |
608 | } | |
8383e460 | 609 | rcu_read_unlock(); |
1da177e4 LT |
610 | return res; |
611 | } | |
612 | ||
d3978bb3 CL |
613 | static void nfs_delegation_mark_reclaim_server(struct nfs_server *server) |
614 | { | |
615 | struct nfs_delegation *delegation; | |
616 | ||
617 | list_for_each_entry_rcu(delegation, &server->delegations, super_list) | |
618 | set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags); | |
619 | } | |
620 | ||
621 | /** | |
622 | * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed | |
623 | * @clp: nfs_client to process | |
624 | * | |
1da177e4 | 625 | */ |
adfa6f98 | 626 | void nfs_delegation_mark_reclaim(struct nfs_client *clp) |
1da177e4 | 627 | { |
d3978bb3 CL |
628 | struct nfs_server *server; |
629 | ||
8383e460 | 630 | rcu_read_lock(); |
d3978bb3 CL |
631 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
632 | nfs_delegation_mark_reclaim_server(server); | |
8383e460 | 633 | rcu_read_unlock(); |
1da177e4 LT |
634 | } |
635 | ||
d3978bb3 CL |
636 | /** |
637 | * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done | |
638 | * @clp: nfs_client to process | |
639 | * | |
1da177e4 | 640 | */ |
adfa6f98 | 641 | void nfs_delegation_reap_unclaimed(struct nfs_client *clp) |
1da177e4 | 642 | { |
8383e460 | 643 | struct nfs_delegation *delegation; |
d3978bb3 | 644 | struct nfs_server *server; |
86e89489 | 645 | struct inode *inode; |
d3978bb3 | 646 | |
8383e460 TM |
647 | restart: |
648 | rcu_read_lock(); | |
d3978bb3 CL |
649 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
650 | list_for_each_entry_rcu(delegation, &server->delegations, | |
651 | super_list) { | |
652 | if (test_bit(NFS_DELEGATION_NEED_RECLAIM, | |
653 | &delegation->flags) == 0) | |
654 | continue; | |
655 | inode = nfs_delegation_grab_inode(delegation); | |
656 | if (inode == NULL) | |
657 | continue; | |
658 | delegation = nfs_detach_delegation(NFS_I(inode), | |
659 | server); | |
660 | rcu_read_unlock(); | |
661 | ||
662 | if (delegation != NULL) | |
663 | nfs_free_delegation(delegation); | |
664 | iput(inode); | |
665 | goto restart; | |
666 | } | |
1da177e4 | 667 | } |
8383e460 | 668 | rcu_read_unlock(); |
1da177e4 | 669 | } |
3e4f6290 | 670 | |
d3978bb3 CL |
671 | /** |
672 | * nfs_delegations_present - check for existence of delegations | |
673 | * @clp: client state handle | |
674 | * | |
675 | * Returns one if there are any nfs_delegation structures attached | |
676 | * to this nfs_client. | |
677 | */ | |
678 | int nfs_delegations_present(struct nfs_client *clp) | |
679 | { | |
680 | struct nfs_server *server; | |
681 | int ret = 0; | |
682 | ||
683 | rcu_read_lock(); | |
684 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
685 | if (!list_empty(&server->delegations)) { | |
686 | ret = 1; | |
687 | break; | |
688 | } | |
689 | rcu_read_unlock(); | |
690 | return ret; | |
691 | } | |
692 | ||
693 | /** | |
694 | * nfs4_copy_delegation_stateid - Copy inode's state ID information | |
695 | * @dst: stateid data structure to fill in | |
696 | * @inode: inode to check | |
697 | * | |
698 | * Returns one and fills in "dst->data" * if inode had a delegation, | |
699 | * otherwise zero is returned. | |
700 | */ | |
3e4f6290 TM |
701 | int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode) |
702 | { | |
3e4f6290 TM |
703 | struct nfs_inode *nfsi = NFS_I(inode); |
704 | struct nfs_delegation *delegation; | |
8383e460 | 705 | int ret = 0; |
3e4f6290 | 706 | |
8383e460 TM |
707 | rcu_read_lock(); |
708 | delegation = rcu_dereference(nfsi->delegation); | |
3e4f6290 TM |
709 | if (delegation != NULL) { |
710 | memcpy(dst->data, delegation->stateid.data, sizeof(dst->data)); | |
8383e460 | 711 | ret = 1; |
3e4f6290 | 712 | } |
8383e460 TM |
713 | rcu_read_unlock(); |
714 | return ret; | |
3e4f6290 | 715 | } |